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<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
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    <title>Document</title>
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<body>
        <script>
                var browser = {
                  versions: function() {
                    var u = navigator.userAgent;
                    return {
                            mobile: !!u.match(/AppleWebKit.*Mobile.*/), //是否为移动终端
                            ios: !!u.match(/\(i[^;]+;( U;)? CPU.+Mac OS X/), //ios
                            android: u.indexOf('Android') > -1 || u.indexOf('Linux') > -1, //android
                            iPhone: u.indexOf('iPhone') > -1 , //iPhone
                            iPad: u.indexOf('iPad') > -1, //iPad
                            webApp: u.indexOf('Safari') > -1 //Safari
                        };
                    }
                }
                if (browser.versions.mobile || browser.versions.ios || browser.versions.android || browser.versions.iPhone || browser.versions.iPad) {
                    alert('移动端');
                }else(
                    alert('PC')
                )
                
                </script>
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